- Working on Facebook's React Native platform. Added complete Apple TV support for React Native -- after merging to Facebook's core repository, I now maintain Apple TV (and Android TV) support in a separate community repository. Added APIs supporting focus-based navigation on TV platforms. Made TV work correctly with the new React Native rendering architecture introduced in 2022.- In 2010, developed “Set Dances”, a music application that is a universal app for iPhone, iPad, and iPod touch. It is currently selling on the iTunes App Store.

- Worked on the new Salesforce integration with Microsoft Teams, including running on the new Hyperforce platform- Worked on features in Salesforce's mobile apps (Salesforce Inbox, Salesforce App)- Worked on the Notes feature in Salesforce1 mobile app and Salesforce Lightning Desktop. Includes iOS development, front end web development, and API and backend development.

- Member of the development team for SAP Mobile Platform (SMP), formerly known as Sybase Unwired Platform. Worked on this product’s client framework and infrastructure code. As one of the primary iPhone developers for this product, created significant portions of the SMP iPhone framework. Examples include code for managing multithreaded access to the application’s database on the phone, and code for efficiently parsing JSON-formatted data. Also the primary developer of an SMP component that generates iPhone source code that is specific for a particular SMP application. As part of this work, also made contributions to the development of Sybase Mobile Sales for SAP CRM.- Assisted SAP customers with development of their custom native iOS applications based on the SMP platform. Resolved problems with their applications, especially in the areas of memory management, threading, and proper use of dispatch queues. - Also worked on code for other SMP components, including server Java code and client code for Blackberry and Windows Mobile.- Previously a member of the development team for the M-Business Anywhere product. Was responsible for code maintenance and new development work for code running on Windows Mobile, Palm, and Symbian OS mobile devices.

- Member of the team working on WSDD (WebSphere Studio Device Developer) for MontaVista Linux. This is a Java IDE and virtual machine targeted at embedded devices, and is a joint product of IBM and MontaVista Software. As part of the development team at MontaVista, implemented serial communications support, flash storage support, X windows and Linux framebuffer ports of proprietary graphics APIs. Developed code both in Java and in C using the JNI interface.- Member of the team working on Qt/E development. Implemented support for touchscreen interfaces in Qt/E.- Worked directly with customers on support calls, both on Java and on MontaVista Linux. Handled all support calls related to WSDD, Java, and Qt/E.- Worked on some professional services projects, including device driver and application code development, for MontaVista customers.

- Helped start up a Lawrence Berkeley Lab program to develop advanced electronics boards for deployment in the AMANDA experiment at the South Pole. Developed custom bootloaders and flash-loading firmware for the ARM CPUs running these boards. Ported RTXC (a commercial RTOS) to run on these boards. Helped write a custom RTXC application for them. They have now been successfully deployed deep in the South Pole ice.- Maintained the AMANDA web site (amanda.berkeley.edu). Developed a database with information on all sensors in the currently existing AMANDA array (~ 300) and WWW interface for this database using Perl CGI scripts and a SQL database engine. Helped maintain cluster of Linux workstations.- Supervised graduate students working on the AMANDA project.- Author or co-author of ~80 publications; several single-author publications.- Developed several applications for Palm devices.

- Taught beginning and advanced courses in physics. Lectured to as many as 250 students.Supervised teaching assistants (2 to 10 people, depending on the size of the class). Taught general physics (plus some calculus and other mathematics) to pre-medical students, and taught statistical mechanics to physics majors.